1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_BASE_VIEW_PROP_H_ 6 #define UI_BASE_VIEW_PROP_H_ 7 8 #include "base/basictypes.h" 9 #include "base/memory/ref_counted.h" 10 #include "ui/base/ui_base_export.h" 11 #include "ui/gfx/native_widget_types.h" 12 13 #if !defined(OS_WIN) && !defined(USE_AURA) 14 #error view_prop.h is only for windows and aura builds. 15 #endif 16 17 namespace ui { 18 19 // ViewProp maintains a key/value pair for a particular view. ViewProp is 20 // designed as a replacement for the Win32's SetProp, but does not make use of 21 // window manager memory. ViewProp shares similar semantics as SetProp, the 22 // value for a particular view/key pair comes from the last ViewProp created. 23 class UI_BASE_EXPORT ViewProp { 24 public: 25 // Associates data with a view/key pair. If a ViewProp has already been 26 // created for the specified pair |data| replaces the current value. 27 // 28 // ViewProp does *not* make a copy of the char*, the pointer is used for 29 // sorting. 30 ViewProp(gfx::AcceleratedWidget view, const char* key, void* data); 31 ~ViewProp(); 32 33 // Returns the value associated with the view/key pair, or NULL if there is 34 // none. 35 static void* GetValue(gfx::AcceleratedWidget view, const char* key); 36 37 // Returns the key. 38 const char* Key() const; 39 40 private: 41 class Data; 42 43 // Stores the actual data. 44 scoped_refptr<Data> data_; 45 46 DISALLOW_COPY_AND_ASSIGN(ViewProp); 47 }; 48 49 } // namespace ui 50 51 #endif // UI_BASE_VIEW_PROP_H_ 52